Question Simplify the expression 9k2−30k+25 Evaluate (3k−5)(3k−5)Multiply the terms (3k−5)2Use (a−b)2=a2−2ab+b2 to expand the expression (3k)2−2×3k×5+52Solution 9k2−30k+25 Show Solution Find the roots k=35Alternative Form k=1.6˙ Evaluate (3k−5)(3k−5)To find the roots of the expression,set the expression equal to 0 (3k−5)(3k−5)=0Multiply the terms (3k−5)2=0The only way a power can be 0 is when the base equals 0 3k−5=0Move the constant to the right-hand side and change its sign 3k=0+5Removing 0 doesn't change the value,so remove it from the expression 3k=5Divide both sides 33k=35Solution k=35Alternative Form k=1.6˙ Show Solution
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