Which item should be inserted in the blank to make a perfect square of a^2 +__+9b^2
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Answer:
2(a)(3b)
Step-by-step explanation:
=>a²+2(a)(3b)+9b²
=>a²+6ab+9b²
=>(a)²+2(a)(3b)+(3b)²
=>(a+3b)²
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