5x²-4(x²+1) how to factorise this?​

Question

5x²-4(x²+1)
how to factorise this?​

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Helga 3 years 2021-07-27T11:38:57+00:00 1 Answers 0 views 0

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  1. Calantha
    0
    2021-07-27T11:40:22+00:00
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    Answer:

    (x+2)(x-2)

    Step-by-step explanation:

    We have ,

    \bf = 5x^2 -4(x^2+1)\\\\ \bf= 5x^2-4x^2-4 \\\\\bf= x^2 - 4 \\\\\bf =(x)^2-(2)^2 \qquad\bigg\lgroup \red{ \sf (a+b)(a-b)=a^2-b^2}\bigg\rgroup \\\\\boxed{\red{\bf=(x+2)(x-2)}}

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )