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Please help me with my homework

Mathematics
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Apr 8th, 2015

There are too many questions.....I will solve one each as an example...

17) n^2-4n-32=0, do a cross you get (n+4)(n-8)=0, n1=-4, n2=8

20) 36p^2+9-34=0, 36p^2-25=0, p^2=25/36, p=+/-5/6

22) m^2+20m+100-100-13-8=0, (m+10)^2=121, m+10=+/-11, m1=1, m2=-21

If you have any questions, let me know...........


Apr 8th, 2015

Can you help me with all of them.....

Apr 8th, 2015

Can you help me with all of them.....

Apr 8th, 2015

18) a^2+13a+40=(a+5)(a+8)=0, a1=-5, a2=-8

19) k^2+8k+16=(k+4)^2=0, k=-4

21) 2x^2=150, x^2=75, x=5(3)^0.5

23) n^2-16n-93=0, n^2-16n+64-64-93=0, (n-8)^2=157, n-8=+/-(157)^0.5, n1=(157)^0.5+8, n2=8-(157)^0.5

24) x^2-4x=0, x(x-4)=0, x1=0, x2=4

25) r^2+13r+40=0, (r+5)(r+8)=0, r1=-5, r2=-8

Apr 8th, 2015

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