help me please please please
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Answer:
A. 1. 3x² + x + 9(5x²-10)
FOIL method, multiply.
15x⁴ + 5x³ + 45x² - 30x² - 10x - 90
Add like terms.
= 15x⁴ + 5x³ - 15x² - 10x - 90
≈ 5(3x⁴ + x³ - 3x² - 2x - 18)
2. Subtract 15x⁴ + 5x³ - 15x² - 10x - 90 to 5x² - 4x + 2.
15x⁴ + 5x³ - 15x² - 10x - 90 - (5x² - 4x + 2)
Subtract like terms.
= 15x⁴ + 5x³ - 20x² - 6x - 92
B. 1. 3x² + x + 9, (x = 3)
Substitute x as 3.
= 3(3)² + 3 + 9
Simplify and add.
= 3(9) + 12
Multiply.
= 27 + 12
Add.
= 39
2. 5x²-10, x = 3
Substitute x as 3.
= 5(3)² - 10
Simplify.
= 5(9) - 10
Multiply.
= 45 - 10
Subtract.
= 35.
3. 5x²-4x+2, x = 3.
Substitute x as 3.
= 5(3)² - 4(3) + 2
Simplify and multiply.
= 5(9) - 12 + 2
Multiply and add.
= 45 - 10
Subtract.
= 35
Hope it helps. :'>