(a) (2x2-7)+(5x2-3) 13. Simplify the following. Expand brackets as needed. (f) 4x(x³-r²+3) (b) (a2-5a+7) - (4a² + 8a) (g) (x+8)(x+3) (c) 4x(5x2) (3x5) (h) (a-2)(a-6) (d) 9a(2a - 4) (e) -3a(a³ - 6a) (i) (x² + 5)(2x²+2) (j) (x-5)² (a) 10x - 40 14. Factor completely. (g) r² - 13x+36 (b) 5x +45 (h) r²-2r-63 (c) x3 + 3x² (d) a² - 16 (i) 4a² - 4a - 24 (e) x²+3x-18 (j) 18x² - 32 (f) x²+10x + 21 (k) 9a² - 2562

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