Factorize a² +3ab - 5ab - 15b².

Step-by-step explanation:

Work via factoring by groups:

!) re arrange the terms as follows:

then extract the common factor for the first two terms (a), and separately the common factors for the last two terms (3 b):

Now notice that the binomial factor (a-5 b) is in both expressions, so extract it:

which is the final factorization.

Step-by-step explanation:

a. 12.5 kg

step-by-step explanation:

f = ma

so

m = f/a = (2500 n)/(200 m/s²) = 12.5 kg

1 n = 1 kg·m/s²