Excuse me can i solve it with the normal way instead? like (10x+5)(2x+7) instead of  5(4x2+16x+7)??? please answer me as fast as possible and thank you 

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lightmare -Yes, you can approach using the normal way, but notice that (10x + 5) is still not simplified.  This can be simplified by factoring out a 5:(10x + 5) = 5(2x + 1)So, use the normal way, but look carefully at the result and make sure nothing else can be factored out.Hope that helps