Simplify the following expressions b) y(3y2 - 8xy + 4x) + 3x(2y - 4xy) a) 4x(3x + 7) - 8x(2x - 4) d) y? (4y - 8) - 4y + 6y) c) 6(5x - 12) - 9x(2x2 - 3x + 7) f) y(8x + 3y - 4)-(3x + 7y2) 4x2y(3xy - 7x2 + 8y) - 3xy (12xy-8) 8xy? (7x’y - 3xy) + 3(4x+y) - 7xy?) h) g) 11xyz(3x + 4y - 122) + 3xyz xy(8xy + 12x? - 14y2) – 3x?(7y2 - 11xy) (6xy + 12x*y) - (16y2x + 24x?y2) i) 3x Simplify the following expressions 15x+35xy2-45x”y b) 13xy-262*y+39% 13.xy a) 5.2 -648 +4822-160 802 c) Sz*y+20xy-15 20 d) 1672-8x2 422-1 1) 16x9-3x+24** 5x+3x3 6a6b2+12a2b+-18aºba 2ab(3ab) h) 18x*y2-36x*ya +54x*y* -63.xy 3x4(-3y) g) -81x*y2+21x-15xy+18x3y+9 9xy-12xy i) 24x*y+64xy-36ya 15x2-9x2+2x2 i) Simplify the following expressions (4xy2)2 + v-27x6 b) 9x2y+ + 16x2y+ c) (5x2yz3)3 d) V6426612 + V64a6b12 e) 3x(V9x4) + 3x(1-27x6) If a = -4, b = 1 and c = find the value of each of these expressions​