Solve the polynomial 20x² + 10x² - 5

Combine the like terms: 30x^2 -5
(You cannot evaluate without an X value, or unless you set it equal to zero)
IF it is equal to zero, then this is the answer
x=0.408248,−0.408248

But if this equation isn't set equal to zero, just simplify it to 30x^2 - 5

128/3reason being 5 and 1/3 = 16/316/3 • 2/3 = 32/31 and 1/3 = 4/3 32/3 • 4/3 this will equal 128/3