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7. Find the function value. a. If f(x) = 5x - 7, find f(4) and f(-3). b. If f(x) = 5 - 2x, find f(5) and f(-4). c. If f(x) = x2 + 2x - 7, find f(1) and f(-2)​

Sagot :

BERTHIVEIN

Answer:

a. f(x) = 5x - 7

f(4) = 5(4) - 7

f(4) = 20 - 7

f(4) = 13

f(-3) = 5(-3) - 7

f(-3) = -15 - 7

f(-3) = -22

b. f(x) = 5 - 2x

f(5) = 5 - 2(5)

f(5) = 5 - 10

f(5) = -5

f(-4) = 5 - 2(-4)

f(-4) = 5 + 8

f(-4) = 13

c. f(x) = x^2 + 2x - 7

f(1) = (1)^2 + 2(1) - 7

f(1) = 1 + 2 - 7

f(1) = -4

f(-2) = (-2)^2 + 2(-2) - 7

f(-2) = 4 - 4 - 7

f(-2) = -7

ESTRESIN

Answer:

7.

a. f(x)= 5x-7 ; f(4)

f(4)= 5(4)-7

f(4)= 20-7

f(4)= 13

f(x)= 5x-7 ; f(-3)

f(-3)= 5(-3)-7

f(-3)= -15-7

f(-3)= -22

b. f(x)= 5-2x ; f(5)

f(5)= 5-2(5)

f(5)= 5-10

f(5)= -5

f(x)= 5-2x ; f(-4)

f(-4)= 5-2(-4)

f(-4)= 5+8

f(-5)= 13

c. f(x)= x²+2x-7 ; f(1)

f(1)= (1)²+2(1)-7

f(1)= 1+2-7

f(1)= -4

f(x)= x²+2x-7 ; f(-2)

f(-2)= (-2)²+2(-2)-7

f(-2)= 4-4-7

f(-2)= -7

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