Simplify 5x (3x+7)-4 and find its value for (i) x=2 (ii) x=0
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Answer:
5x (3x + 7) - 4
15x² + 35x - 4
(i) x = 2 (ii) x = 0
= 15 (2)² + 35 (2) - 4 = 15 (0)² + 35 (0) - 4
= 15(4) + 70 - 4 = 15(0) + 0 - 4
= 60 + 70 - 4 = 0 + 0 - 4
= 130 - 4 = 0 - 4
= 126 = -4
Hope it helps...
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