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Dear student,

20 a) x (x^{2} + 3 x + 5) + 7 = x^{3} + 3 x^{2} + 5 x + 7 i) P u t t i n g x = - 1 = (- 1)^{3} + 3 (- 1)^{2} + 5 (- 1) + 7 = - 1 + 3 - 5 + 7 = - 1 - 5 + 3 + 7 = - 6 + 10 = 4 S i m i l a r l y y o u c a n s o l v e (i i) p a r t b) 4 y (3 y - 8) - 10 = 12 y^{2} - 32 y - 10 i) P u t t i n g y = 2 = 12 {(2)}^{2} - 32 (2) - 10 = 12 \times 4 - 64 - 10 = 48 - 64 - 10 = - 16 - 10 = - 26 S i m i l a r l y y o u c a n s o l v e (i i) p a r t

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