3x - 2 = 19
Add 2 to each side:
3x = 21
Divide each side by 3:
x = 7
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3x2 - 10x - 8 = (3x + 2) (x - 4)
3x2-4x-15 = 0 (3x+5)(x-3) = 0 x = -5/3 or x = 3
3x2+x-4 = 0 (3x+4)(x-1) = 0 Solutions: x = 1 and x = -4/3 By using the quadratic equation formula.
To find the value of the expression 4x - 2y + xy when x = -1 and y = 5, we first substitute the values of x and y into the expression. This gives us 4(-1) - 2(5) + (-1)(5). Simplifying this further, we get -4 - 10 - 5, which equals -19. Therefore, the value of the expression is -19 when x = -1 and y = 5.
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