Solve 17+18m+m^2

$$17 + 18 m + m ^ { 2 }$$

Factor

$$\left(m+1\right)\left(m+17\right)$$

Solution Steps

Rearrange the polynomial to put it in standard form. Place the terms in order from highest to lowest power.

$$m^{2}+18m+17$$

Factor the expression by grouping. First, the expression needs to be rewritten as m^{2}+am+bm+17. To find a and b, set up a system to be solved.

$$a+b=18 ab=1\times 17=17$$

Since ab is positive, a and b have the same sign. Since a+b is positive, a and b are both positive. The only such pair is the system solution.

$$a=1 b=17$$

Rewrite m^{2}+18m+17 as \left(m^{2}+m\right)+\left(17m+17\right).

$$\left(m^{2}+m\right)+\left(17m+17\right)$$

Factor out m in the first and 17 in the second group.

$$m\left(m+1\right)+17\left(m+1\right)$$

Factor out common term m+1 by using distributive property.

$$\left(m+1\right)\left(m+17\right)$$

Steps Using the Quadratic Formula

Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.

$$m^{2}+18m+17=0$$

All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.

$$m=\frac{-18±\sqrt{18^{2}-4\times 17}}{2}$$

Square 18.

$$m=\frac{-18±\sqrt{324-4\times 17}}{2}$$

Multiply -4 times 17.

$$m=\frac{-18±\sqrt{324-68}}{2}$$

Add 324 to -68.

$$m=\frac{-18±\sqrt{256}}{2}$$

Take the square root of 256.

$$m=\frac{-18±16}{2}$$

Now solve the equation m=\frac{-18±16}{2} when ± is plus. Add -18 to 16.

$$m=-\frac{2}{2}$$

Divide -2 by 2.

$$m=-1$$

Now solve the equation m=\frac{-18±16}{2} when ± is minus. Subtract 16 from -18.

$$m=-\frac{34}{2}$$

Divide -34 by 2.

$$m=-17$$

Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute -1 for x_{1} and -17 for x_{2}.

$$m^{2}+18m+17=\left(m-\left(-1\right)\right)\left(m-\left(-17\right)\right)$$

Simplify all the expressions of the form p-\left(-q\right) to p+q.

$$m^{2}+18m+17=\left(m+1\right)\left(m+17\right)$$

Evaluate

$$\left(m+1\right)\left(m+17\right)$$