Question

Please solve this equation if anyone knows it and send me image of full solved equation. (Improved question )

Answer 1

Answer:

Step-by-step explanation:

I'm using my laptop

I re-arrange the equation first

$-R^2 + 40R - 300 = 0\\-R^2 + 10R + 30R - 300 = 0\\-R(R-10) +30(R-10)\\= (-R+30)(R-10)$

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