use suitable identity to get each of the following products:
1. (x+3) (x+3)
2.(6z-7) (6z+7)
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Step-by-step explanation:
1. (x + 3) (x + 3)
= (x + 3)²
= x² + 3² + (2 × x × 3)
= x² + 9 + 6x
2. (6z - 7) (6z + 7)
= (6z)² - (7)²
= 36z² - 49
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