please do this tommorow is my maths exam
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sorry? could you please ask more appropriately because I think your question is incomplete
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Step-by-step explanation:
(√5 -√7) (√5 + 2√7 )
=√5 (√5-√7)-√7(√5+2√7)
=((√5)^2 -√35) -(√35 +2(√7)^2)
=(5-√35)+(√35+14)
=5(√35 + 14) -√35(√35 +14)
=(5√35 +70) - ((√35)^2 -14√35)
=5√35 + 70-35+14√35
=35+(5+14)√35
=35+19√35
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