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Multiply the monomial by the binomial and find the value of each for x = -1, y = 0.25 and z = 0.005:(i) 15y2 (2 – 3x)(ii) -3x (y2 + z2) |
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Answer» (i) 15y2 (2 – 3x) = 30y2 – 45xy2 By evaluating the values in the expression x = -1, y = 25/100 and z = 5/1000 = 30 × (25/100)2 – 45 × (-1) × (25/100)2 = 30 (1/16) + 45 (1/16) = 15/8 + 45/16 = (30+45)/16 = 75/16 (ii) -3x (y2 + z2) = -3xy2 + -3xz2 By evaluating the values in the expression x = -1, y = 25/100 and z = 5/1000 = -3× (-1) × (25/100)2 – 3 × (-1) × (5/1000)2 = (3×25×25/100×100) + (3×5×5/1000×1000) = 3/16 + 3/40000 = 39/200 |
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