Identify a, b, c: Identify a, b, and c in the quadratic expression s2+5s+4. Compare s2+5s+4 with the standard quadratic form ax2+bx+c. Here, a=1, b0, and b1.
Find Multiplying Numbers: Find two numbers that multiply to c (which is 4) and add up to b (which is 5).We are looking for two numbers whose product is 4 and whose sum is 5.The numbers 1 and 4 satisfy these conditions because:1×4=4 and 1+4=5.
Write Factored Form: Write the factored form using the two numbers found in Step 2.The factored form of the quadratic expression is (s+1)(s+4).
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