1.
a² + b² = (-1)² + 4² = 1+16= 17
2ab + 6a - 7b = 2*(-3)*(-6) + 6*(-3) - 7 * (-6) = 36 - 18 + 42 = 42 + 18 = 60
2.
-3ab + b² + 3ab -2ab +( -42ab) =
b² - 44ab
3.
4x + 7(x -5) - 8x - 2 (-3x+8) +10 -12x =
4x + 7x - 35 - 8x - 6x -16 + 10 -12x =
-15x - 41
7x + (-6x + 7) -(-24x-5) +32x -43 =
7x - 6x + 7 + 24x + 5 + 32x - 43 =
x + 24x + 32x + 7 + 5 - 43 =
57x - 31
