13.
16(a + b)2 - 9(a - b)2
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Answer:
7a + 50b
Step-by-step explanation:
16(a+b) 2-9(a - b) 2
16a + 16b * 2 - 9a +9b * 2
16a + 32b - 9a + 18b
16a -9a +32b +18b
7a + 50b
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