FUNCTIONS 3

Given that one of the roots of the equation 3x² - m(x+1) + 5 = 0 is 7, find m.

Solution

Substitute x=7, in the above equation.

3(7)² - m(7+1) + 5 = 0

(3x49) - (m x 8) + 5 = 0

147 - 8m + 5 = 0

-8m + 152 = 0

-8m = -152

-8m = -152

-8          -8

m= ¹⁵²/8

Hence m= ¹⁵²/8

TRY THIS…………………………..

Given that one of the roots of the equation 3x² - h(x+1) - 9 = 0 is 2, find h.