Answer:
10 + 4√7
Explanation:
Use the distributive property:
(A + B)(C + B) = (AC + AB) + (BC + B^2) = B^2 + AC + AB + BC
(3 + √7)(1 + √7)
= (√7)^2 + (3 * 1) + (3 * √7) + (√7 * 1)
and simplify.
= 7 + 3 + 3√7 + √7
= 10 + 4√7
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