Answer
86
Work Step by Step
Given 3$x^{2}$ - 4x -9, x=-5
Step 1: Put the value of x=-5 for each x in the expression
=3$(-5)^{2}$ - 4(-5) -9
Step 2: Evaluate the exponential expression$(-5)^{2}$ = (-5)(-5) = 25
=3( 25)-4(-5)-9
Step 3: Multiply 3(25) = 75 and 4(-5)= -20
=75 +20 -9
Step 4: Add and Subtract from left to right
first add 75+20
95-9
subtract
86
