Answer:
the answer is a(3a+7)
Step-by-step explanation:
to factorize u need to select the variable that is common to both sidesand that variable is a
in the first half he would have swam 1 km. there are 1000m in a km so 1000/200=5 so he swam the first 200 fly, then a 200 breast, then a 200 fly again, then another 200 breast the finish the first 1 km with a 200 fly. so we switched strokes 4 times.
PS i wouldn't recommend doing a 2 km swim fly and breast
The answer is c trust me it is c trust me the answer is c just trust me it is c