Solve for y
y=7\left(x^{2}+7\right)
Solve for x (complex solution)
x=-\frac{\sqrt{7\left(y-49\right)}}{7}
x=\frac{\sqrt{7\left(y-49\right)}}{7}
Solve for x
x=\frac{\sqrt{7\left(y-49\right)}}{7}
x=-\frac{\sqrt{7\left(y-49\right)}}{7}\text{, }y\geq 49
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y=7x^{2}-\left(-28\right)+21
Multiply 4 and -7 to get -28.
y=7x^{2}+28+21
The opposite of -28 is 28.
y=7x^{2}+49
Add 28 and 21 to get 49.
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