Question

PLEASE TELL ANSWER STEP BY STEP I WILL MARK BRAINLIST AND GIVE POINTS ​

Answer 1

Answer:

a) 5 - 3x + 9x²

substituting x with -3, we get

5 - 3(-3) + 9(-3)²

-3×-3 = 9

(-3)² = 9.

so,

5 + 9 + 81 = 95

b) 7x³ - 5x² + x - 8

x = -3

so,

7(-3)³ - 5(-3)² + -3 - 8

-3³ = -3 × -3 × -3 = -27

-3² = -3 × -3 = 9

so, we get

(7×-27) + (5 × 9) - 3 -8

= -189 - 45 - 3 - 8

= -245

Please Mark me as brainliest if this helped.

Answer 2

Answer:

a) 5-3(-3)+9(-3)²

5-(-9)+9(9)

5+9+81

95

b) 7(-3)³-5(-3)²+(-3)-8

7(-27)-5(9)-3-8

-189-45-3-8

-245