Question Simplify the expression 9x2−42x+49 Evaluate (3x−7)2Use (a−b)2=a2−2ab+b2 to expand the expression (3x)2−2×3x×7+72Solution 9x2−42x+49 Show Solution Find the roots x=37Alternative Form x=2.3˙ Evaluate (3x−7)2To find the roots of the expression,set the expression equal to 0 (3x−7)2=0The only way a power can be 0 is when the base equals 0 3x−7=0Move the constant to the right-hand side and change its sign 3x=0+7Removing 0 doesn't change the value,so remove it from the expression 3x=7Divide both sides 33x=37Solution x=37Alternative Form x=2.3˙ Show Solution
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