Hi all,
I’m looking to refresh my brain for helping my children in their Nat 5’s
i have an equation which is telling me I’m wrong
Simplify 5√2 x √8 / 2√2
i worked it out as
= 5√16 / 2√2
= 20 / 2√2
= 10√2
where am I going wrong?
Nothing to be sorry about. Making mistakes and fixing them -- whether on your own or with help from others -- is, IMHO, the most effective way to learn.So sorry.
I’ve since worked it out
5√2 x √8 / 2√2
= 5√2 x √2x4 / 2√2
= 5√2 x 2√2 / 2√2
= 5√2
What you wrote is \(\displaystyle \dfrac{5\sqrt{2}x\sqrt{8}}{2}\sqrt{2}\ =\ \dfrac{5\sqrt{2}x\sqrt{8}\sqrt{2}}{2}\) but you seem to be solving for \(\displaystyle \dfrac{5\sqrt{2}x\sqrt{8}}{2\sqrt{2}}\)Hi all,
I’m looking to refresh my brain for helping my children in their Nat 5’s
i have an equation which is telling me I’m wrong
Simplify 5√2 x √8 / 2√2
This is true; but the equivalent without the multiplication signs, as in "5√2 x √8 / 2√2", is not interpreted that way everywhere. It appears to be taught in some places (perhaps largely outside the U.S.) that in an expression like the one given, the multiplication is taken as being in the denominator. Clearly the OP takes it that way; whether it is what is taught there is unclear, but quite possible.What you wrote is \(\displaystyle \dfrac{5\sqrt{2}\times\sqrt{8}}{2}\sqrt{2}\ =\ \dfrac{5\sqrt{2}\times\sqrt{8}\sqrt{2}}{2}\) but you seem to be solving for \(\displaystyle \dfrac{5\sqrt{2}\times\sqrt{8}}{2\sqrt{2}}\)
Please not[e] that 5*4/2*8\(\displaystyle \neq\)20/16. Rather it equals 80. If you want to divide by 2*8 you need to put parentheses. Like 5*4/(2*8)=20/16