## Thinking Mathematically (6th Edition)

Given 2$x^{2}$ - 5x -6, x=-3 Step 1: Put the value of x=-3 for each x in the expression =2$(-3)^{2}$ - 5(-3) -6 Step 2: Evaluate the exponential expression$(-3)^{2}$ = (-3)(-3) = 9 =2( 9)-5(-3)-6 Step 3: Multiply 2(9) = 18 and 5(-3)= -15 =18 +15-6 Step 4: Add and Subtract from left to right first add 18+15 = 33 33-6 subtract 27