Question Simplify the expression 49x2−56x+16 Evaluate (7x−4)(7x−4)Multiply the terms (7x−4)2Use (a−b)2=a2−2ab+b2 to expand the expression (7x)2−2×7x×4+42Solution 49x2−56x+16 Show Solution Find the roots x=74Alternative Form x=0.5˙71428˙ Evaluate (7x−4)(7x−4)To find the roots of the expression,set the expression equal to 0 (7x−4)(7x−4)=0Multiply the terms (7x−4)2=0The only way a power can be 0 is when the base equals 0 7x−4=0Move the constant to the right-hand side and change its sign 7x=0+4Removing 0 doesn't change the value,so remove it from the expression 7x=4Divide both sides 77x=74Solution x=74Alternative Form x=0.5˙71428˙ Show Solution
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