Question Simplify the expression 25t2−20t+4 Evaluate (5t−2)2Use (a−b)2=a2−2ab+b2 to expand the expression (5t)2−2×5t×2+22Solution 25t2−20t+4 Show Solution Find the roots t=52Alternative Form t=0.4 Evaluate (5t−2)2To find the roots of the expression,set the expression equal to 0 (5t−2)2=0The only way a power can be 0 is when the base equals 0 5t−2=0Move the constant to the right-hand side and change its sign 5t=0+2Removing 0 doesn't change the value,so remove it from the expression 5t=2Divide both sides 55t=52Solution t=52Alternative Form t=0.4 Show Solution
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