Question

-4√7+9√7 with method​

Answer 1

Answer:

5√7

Step-by-step explanation:

-4√7 + 9√7

[-4+9](√7)

5(√7)

5√7

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Answer 2

Answer:

5$\sqrt{7}$

Step-by-step explanation:

consider that

$\sqrt{7}=x$

then reframing the equation we get

$-4x+9x\\9x-4x\\5x$

now converting x back we get

5$\sqrt{7}$