Solve 1+x^2+3^2=73^80

$$1 + x ^ { 2 } + 3 ^ { 2 } = 73 ^ { 80 }$$

Solve for x

$$x=27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}\approx 3.411256725 \cdot 10^{74}$$

$$x=-27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}\approx -3.411256725 \cdot 10^{74}$$

Steps by Finding Square Root

Calculate 3 to the power of 2 and get 9.

$$1+x^{2}+9=73^{80}$$

Add 1 and 9 to get 10.

$$10+x^{2}=73^{80}$$

Calculate 73 to the power of 80 and get 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801.

$$10+x^{2}=116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801$$

Subtract 10 from both sides.

$$x^{2}=116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801-10$$

Subtract 10 from 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801 to get 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791.

$$x^{2}=116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791$$

Take the square root of both sides of the equation.

$$x=27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879} x=-27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}$$

Steps Using the Quadratic Formula

Calculate 3 to the power of 2 and get 9.

$$1+x^{2}+9=73^{80}$$

Add 1 and 9 to get 10.

$$10+x^{2}=73^{80}$$

Calculate 73 to the power of 80 and get 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801.

$$10+x^{2}=116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801$$

Subtract 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801 from both sides.

$$10+x^{2}-116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801=0$$

Subtract 116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668801 from 10 to get -116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791.

$$-116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791+x^{2}=0$$

Quadratic equations like this one, with an x^{2} term but no x term, can still be solved using the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}, once they are put in standard form: ax^{2}+bx+c=0.

$$x^{2}-116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and -116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\left(-116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791\right)}}{2}$$

Square 0.

$$x=\frac{0±\sqrt{-4\left(-116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791\right)}}{2}$$

Multiply -4 times -116366724419887537192304639462437050288714840990835651014443275657231013786872000204932293070142925751196831125400285112721763382330952680277728668791.

$$x=\frac{0±\sqrt{465466897679550148769218557849748201154859363963342604057773102628924055147488000819729172280571703004787324501601140450887053529323810721110914675164}}{2}$$

Take the square root of 465466897679550148769218557849748201154859363963342604057773102628924055147488000819729172280571703004787324501601140450887053529323810721110914675164.

$$x=\frac{0±54\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}}{2}$$

Now solve the equation x=\frac{0±54\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}}{2} when ± is plus.

$$x=27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}$$

Now solve the equation x=\frac{0±54\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}}{2} when ± is minus.

$$x=-27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}$$

The equation is now solved.

$$x=27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879} x=-27\sqrt{159625136378446553075863702966305967474231606297442593984147154536668057320812071611704105720360666325372882202195178481099812595790058546334332879}$$