Answered


Write an equation that defines m(x) as a trinomial where m(x) = (3x - 1)(3 - x) + 4x^2 + 19.
Solve for x when m(x) = 0.



Answer :

ashisthebest1
m(x) = (3x - 1)(3 - x) + 4x^2 + 19
0 = 9x - 3x^2 - 3 + x + 4x^2 + 19
0 = x^2 + 10x + 16 
now use quadratic formula
a = 1 b = 10 c = 16
x = -b +/- √b²-4ac ÷ 2a
x = -10 +/- √100 - 4(16) ÷ 2
x = -10 +/- √100-64 ÷ 2
x = -10 +/- √36 ÷ 2
split the equation
x = -10 - 6 ÷ 2         and        x = -10 + 6 ÷ 2
x = -16 ÷ 2                           x = -4 ÷ 2
x = -8                                   x = -2
so the value for x are -8 and -2

Panoyin
m(x) = (3x - 1)(3 - x) + 4x² + 19
     0 = 3x(3 - x) - 1(3 - x) + 4x² + 19
     0 = 3x(3) - 3x(x) - 1(3) + 1(x) + 4x² + 19
     0 = 9x - 3x² - 3 + x + 4x² + 19
     0 = -3x² + 4x² + 9x + x - 3 + 19
     0 = x² + 10x + 16
     x = -(10) ± √((10)² - 4(1)(16))
                          2(1)
     x = -10 ± √(100 - 64)
                        2
     x = -10 ± √(36)
                   2
     x = -10 ± 6
                2
     x = -5 ± 3
     x = -5 + 3    U    x = -5 - 3
     x = -2    U    x = -8