Question Simplify the expression 49−42x+9x2 Evaluate (7−3x)2Use (a−b)2=a2−2ab+b2 to expand the expression 72−2×7×3x+(3x)2Solution 49−42x+9x2 Show Solution Find the roots x=37Alternative Form x=2.3˙ Evaluate (7−3x)2To find the roots of the expression,set the expression equal to 0 (7−3x)2=0The only way a power can be 0 is when the base equals 0 7−3x=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=−7Change the signs on both sides of the equation 3x=7Divide both sides 33x=37Solution x=37Alternative Form x=2.3˙ Show Solution
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