## Thinking Mathematically (6th Edition)

Given -5$x^{2}$ - 4x -11, x=-1 Step 1: Put the value of x=-1 for each x in the expression =-5$(-1)^{2}$ - 4(-1) -11 Step 2: Evaluate the exponential expression$(-1)^{2}$ = (-1)(-1) = 1 =-5( 1)-4(-1)-11 Step 3: Multiply -5(1) = -5 and 4(-1)= -4 =-5 +4 -11 Step 4: Add and Subtract from left to right first add -5+4 -1-11 subtract -12