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math

AlgebraHouse AlgebraHouse
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Re: math

f(x) = x² + 3x - 4
f(-7) = (-7)² + 3(-7) - 4   {substituted -7 for x}
=  49 - 21 - 4   {evaluated exponent and multiplied}
=  24   {subtracted}

f(3) = 3² + 3(3) - 4   {substituted 3 for x}
= 9 + 9 - 4   {evaluated exponent and multiplied}
=  14   {added and subtracted}

- Algebra House