The perimeter of an isosceles triangle is 1m, and the legnth of the base is equal to 0.4m. find the legnth of a leg?

Your answer would be 0.3m.

This is because an isosceles triangle has two sides of the same length, usually on either side above the base, which means we can first do 1 - 0.4 = 0.6m to get the total amount that the two sides add up to, and then 0.6 ÷ 2 = 0.3 to get how long each side is.

I hope this helps!

Calculate Δ = b^2 -4ac => Δ = 169 => k1 = 3/2; k2 = -5 => 2k^2 + 7k - 15 = 2*(k -3/2)(k+5) = (2k - 3)(k+5);