Posted by babygirl on .
want to know if this right simplify and show all work
3x^2+4xy+7y^2+2(3x^2+5xy+11y^2)
3x^2+4xy+7y^26y^2+10xy+22y^2
3x^2+14xy+45y^2
and
6a4a2(100^2+3a)
6a4a^2+200+3a
3a4a^2+200

algebra 
Jai,
in the second line of your solution, 2*(3x^2) = 6x^2 not 6y^2. thus,
3x^2 + 4xy + 7y^2  6x^2 + 10xy + 22y^2
9x^2 + 14xy + 29y^2
..for the second problem, i think there are typos. please check the problem again. also, 100^2 is not equal to 200.