exam Maths Puzzle Numerical Ability

I have a test coming up soom, and the instructor give us some problem for practice, but I am having some problem with the subject, can you explain me this two problems?

2. Suppo

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exam Other Question

5) solve 4x+x(x-1)=0
find the x-intercepts of f(x)=4x+x(x-1)
What are the solutions x=��.
What are the x-intercepts explain why there is no value of x for which the expressions x + 3 and x + 4 are equal?

My 7th grade son has this question on one of his worksheets and sadly I am unable to help him.

Thanks so much in advance for your help