Question 238786


{{{9x^2+8x-7}}} Start with the given polynomial.



{{{9(-3)^2+8(-3)-7}}} Plug in {{{x=-3}}}.



{{{9(9)+8(-3)-7}}} Square {{{-3}}} to get {{{9}}}.



{{{81+8(-3)-7}}} Multiply {{{9}}} and {{{9}}} to get {{{81}}}.



{{{81-24-7}}} Multiply {{{8}}} and {{{-3}}} to get {{{-24}}}.



{{{50}}} Combine like terms.



So {{{9x^2+8x-7=50}}} when {{{x=-3}}}