Find f(-7) if f(x) = 2x + 8.A. -6 B. 2 C. 3 D. 22

Mathematics

1 answer:

spayn [35]3 years ago

7 0

To find f(-7), just plug -7 in for all x

2(-7) + 8
-14 + 8
-6 is the answer!

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Answer: if this is supposed to be in slope-intercept form

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One leg of a right triangle is 7 inches longer than the smaller leg and the hypotenuse is 8 inches longer than the smaller leg.

Makovka662 [10]

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${z}^{2} = {x}^{2} + {y}^{2} \\ (x + 8) ^{2} = {x}^{2} + (x + 7) ^{2} \\ {x}^{2} + 16x + 64 = {x}^{2} + {x}^{2} + 14x + 49 \\ {x}^{2} + 16x + 64 = 2 {x}^{2} + 14x + 49 \\ {x}^{2} - 2 {x}^{2} + 16x - 14x + 64 - 49 = 0 \\ - {x}^{2} + 2x + 15 = 0 \\ {x}^{2} - 2x - 15 = 0 \: \: (multiplied \: by \: - 1) \\ (x - 5)(x + 3) = 0 \\ then \: \: x = 5 \: \: or \: \: x = - 3$
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Step-by-step explanation:

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Find f(-7) if f(x) = 2x + 8.A. -6 B. 2 C. 3 D. 22​

Find f(-7) if f(x) = 2x + 8.A. -6 B. 2 C. 3 D. 22