multiply: (5x²-3x-7) by (4x+3) and verify the result when x = 2
lesson related algebraic expression and identities
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Step-by-step explanation:
(5x²-3x-7) by (4x+3)
→ (5x²-3x-7) × (4x+3)
→ 5x² × (4x+3) - 3x × (4x+3) - 7 × (4x+3)
→ 20x³ + 15x² - 12x² - 9x² - 28x - 21
→ 20x³ - 6x² - 28x - 21
→ When x = 2
→ 20(2)³ - 6(2)² - 28×2 - 21
→ 20(8) - 6(4) - 56 - 21
→ 160 - 24 - 56 - 2
→ 78
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