evaluate (2x/5+3y/4-4z/7)to the power of 2this is from chapter Expansions(including substitution)
Evaluate is not the right word here, since that means to find the value. I believe you mean "expand" since the chapter is called expansions and I don't see anything else to do with this problem.
Remember, squaring means multiplying by itself. So you're interested in` `
Now you just use the distributive property 3 times to multiply these trinomials:
` ``+(3y)/4*(2x)/5+(3y)/4*(3y)/4-(3y)/4*(4z)/7`` `
` ``-(4z)/7*(2x)/5-(4z)/7*(3y)/4+(4z)/7*(4z)/7`` `
It's a bit tedious, but now you combine all the like terms. I'll start by multiplying each pair of fractions:
Now combine the like terms
And you're done!