exam Maths Puzzle Numerical Ability

Two types of bacteria are grown in a lab and their populations studied. One population initially contained 320 spores and was found to triple in size every 12 days. The second popu

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Useing the PEMEDS expesssion, (Please, excuse, my dear, aunt sally)

Simplify

1. 2+3*5^2-7

2. 6+3[(12/4)+5]

3. (4/2)+4(5-2)^2

4. -8-81/9*2^2+7 I have a question that states: find all real zeros of the function:
a)f(x)=-7x^4+343x^2
b)f(x)=x^4-16x^2+15

I have no idea how to do these