# Chapter 6 - Algebra: Equations and Inequalities - 6.1 Algebraic Expressions and Formulas - Exercise Set 6.1: 26

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

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