Question Simplify the expression 16x2−56x+49 Evaluate (4x−7)2Use (a−b)2=a2−2ab+b2 to expand the expression (4x)2−2×4x×7+72Solution 16x2−56x+49 Show Solution Find the roots x=47Alternative Form x=1.75 Evaluate (4x−7)2To find the roots of the expression,set the expression equal to 0 (4x−7)2=0The only way a power can be 0 is when the base equals 0 4x−7=0Move the constant to the right-hand side and change its sign 4x=0+7Removing 0 doesn't change the value,so remove it from the expression 4x=7Divide both sides 44x=47Solution x=47Alternative Form x=1.75 Show Solution
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