What is the value of the function when f(-3)

f(x)= 2x^+5x-9

Angles 2 and 6 have the same measurements.to find the value of "x", we can write and solve an equation. set it up like this: 6x + 8 = 8x - 6subtract 8x from both sides to get -2x + 8 = -6. subtract 8 from both sides to get -2x = -14. now, divide each side by -2 to isolate the "x". because you are dividing a negative by a negative, your quotient will be positive. -14/-2 is 7. let's plug in this value and see if it works. 6 * 7 is 42. 42 + 8 is 50. 8 * 7 is 56. 56 - 6 is 50. 50 = 50. the answer is  x = 6.